// 220102 15:27

var buf1 = Buffer.from('先进编程技术研究');
var buf2 = Buffer.from('www.github.com');
var buf3 = Buffer.concat([buf1, buf2]);
console.log('result:');
console.log(buf3);
console.log(buf3.toString());

var buf10 = Buffer.concat([buf1, buf2], 10); // 10: bytes
console.log('result-2:');
console.log(buf10); // 10个字节
console.log(buf10.toString()); // 结果存在乱码
